The basic way it works, is you send them $10 or $25 via paypal including your email address, they email you back a link to a password protected zip file you download and extract with the password they email you. Then you copy those files in the Zip into your current DSD+ installation(check the readme). After setup, the current version has a 'check for update automatically' feature that just runs and updates your install as you go along. I signed up several months ago, and haven't gotten an update yet. I'm on version 2.246. I disabled the automatic update check though, and will probably be content and happy with the current version I have until the end of time, or until some super awesome new feature I can't live without comes out. They may also email you an update link, not sure. I haven't gotten one, but since everything works fine for me, it wouldn't bother me if they didn't update me.